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<p><strong>Abstract.</strong> Anomalous decreases on water levels were observed in 78 % of wells in central Taiwan about 250 days before the Chi-Chi earthquake whose magnitude is 7.6 on 20 September 1999. Variations in groundwater levels measured on anomalous wells from 1 August 1997 to 19 September 1999, were transferred into the frequency domain to unveil frequency characteristics. Analytical results show that amplitudes at the frequency band between 0.02 and 0.04 day<sup>&minus;1</sup>doi:10.5194/piahs-372-101-2015 fatcat:hvbxhlszvfh7zoove5x7gzaetm